Fig. 4

The central nervous system and midgut in the trunk of Callipallene tiberii (Callipallenidae). Reconstructions of the CNS (3D volume rendering, green) and midgut (3D surface, magenta) based on a µCT scan of an adult female. The white arrowheads point to the origin of the posteriorly projecting proctodeal nerve. For better pattern visualization, all major nerves of the right body half were virtually removed in A (right side) and B. A Oblique antero-lateral view. Right top corner: overview of the complete specimen. Left side: complete CNS and midgut reconstruction. Right bottom corner: anterior portion of the CNS and eyes. B Lateral view of the CNS with and without the midgut structures (top and bottom, respectively). For reference, unreconstructed parts of the right body half are shown in transparent gray. The double arrows point to intersegmental longitudinal musculature. The white arrow highlights the fusion area of brain and subesophageal ganglion. C Ventral view. Left side: CNS in grayscale. The black arrowheads point to the intersegmental nerves. Right side: CNS and midgut. For reference, unreconstructed dorsal parts of the trunk are shown in transparent gray